 | Marcello Mastroianni als Marcello Polletti |
 | Ursula Andress als Caroline Meredith |
 | Elsa Martinelli als Olga |
 | Salvo Randone als Professor |
 | Massimo Serato als Lawyer |
 | Milo Quesada als Rudi |
 | Luce Bonifassy als Lidia |
 | George Wang als Chinese Attacker |
 | Evi Rigano als Victim |
| Walter Williams als Martin |
| Richard Armstrong als Cole |
| Antonio Ciani |
 | Anita Sanders als Relaxatorium Girl (uncredited) |
 | Pier Paolo Capponi als Terrace Snack Bar Manager (uncredited) |
 | Jacques Herlin als Masoch Club Manager (uncredited) |
| Wolfgang Hillinger als Baron von Richtofen (uncredited) |
 | Mickey Knox als Chet (uncredited) |
 | Gino Pernice als Hunter (uncredited) |
 | Massimo Righi als Journalist (uncredited) |
 | Giovanni Ivan Scratuglia als Priest in Aeroplane (uncredited) |
| Elio Petri | Director |
| Piero Piccioni | Original Music Composer |
| Ennio Sensi | Sound |
| Giuseppe Banchelli | Makeup Artist |
| Alfredo Melidoni | Production Supervisor |
| Giulio Coltellacci | Costume Design |
| Ruggero Mastroianni | Editor |
| Lina Cassini | Hairstylist |
| Claudio Mancini | Production Supervisor |
| Gianni Di Venanzo | Director of Photography |
| Emilio Rosa | Sound |
| Piero Poletto | Production Design |
| Giovanni Checchi | Set Decoration |
| Carlo Ponti | Producer |
| Dario Micheli | Set Decoration |
| Enrico Sabbatini | Assistant Costume Designer |
| Renata Clerici | Script Supervisor |
| Pasqualino De Santis | Camera Operator |
| Robert Sheckley | Novel |
| Tonino Guerra | Screenplay |
| Giorgio Salvioni | Screenplay |
| Ennio Flaiano | Screenplay |
| Elio Petri | Screenplay |
| Jone Tuzi | Production Coordinator |
| Piero Piccioni | Conductor |
| Giorgio Russo | Production Secretary |
| Adriano Pagani | Production Secretary |
| Berto Pelosso | First Assistant Director |
| Mario Masini | Assistant Camera |
| Carlo Palmieri | Sound Recordist |
